I almost every society people celebrate the anniversary of their birth. Their friends and those who love them join in the celebration with cards, presents and other tokens; they are glad that the birthday person was born and show it.
For some, life is a series of celebrations punctuated by sorrow and despair. For others life is a series of despair and sorrow punctuated by some joy and celebrations. Our lives are just bitter herbs mixed with boiled wheat and sugar. We do not control the mixture, but can control which parts of it we can easily digest.